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Simplified integral energy method: Application to pass by noise
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Vibration monitoring. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2006 (English)In: Int. Congr. Sound Vib., ICSV, 2006, 2919-2926 p.Conference paper (Refereed)
Abstract [en]

The pass-by noise measurements defined in a standard procedure constitute a legal test for every new vehicle. Nowadays, the improvements of the engineering process allow automotive manufacturers to reduce the vehicle development cycles. Consequently, the acoustic optimization of the vehicle applied to reduction of the exterior noise needs to be considered as soon as possible to avoid repeated road tests depending strongly on the environmental conditions. At the early stage of the development process, Renault would like therefore to use an accurate tool which predicts the engine compartment contribution to pass-by noise. This model will give indications to answer technical issues like: The influence of acoustical materials or height of the vehicle on pass-by noise in the high frequency range. In medium and high frequency domains, classical numerical methods such as the Finite Element Method (FEM) or the Boundary Element Method (BEM) are not well suited to predict the engine contribution because of the prohibitive computation time and memory occupation. Some energy methods such as statistical energy Analysis (SEA) will only give global values in each substructure and are not suited to outside airborne noise propagation. In this paper, a simplified integral energy method is developed to predict the noise induced by the engine sources during the pass-by noise test in the medium and high frequency range. We will consider a local energy balance and solve an integral equation to predict the noise emitted by the engine in a short computation time. One of the main contributions of this paper is the calculation of the visibilities between elements to take into account the presence of the engine. Standard pass-by noise measurements done on a test track are compared with those obtained by the simplified energy method.

Place, publisher, year, edition, pages
2006. 2919-2926 p.
, 13th International Congress on Sound and Vibration 2006, ICSV 2006, 4
Keyword [en]
Acoustic optimization, Automotive manufacturers, Engine compartments, Environmental conditions, Medium and high frequencies, Standard procedures, Statistical energy analysis, Vehicle development, Acoustic noise measurement, Boundary element method, Engines, Forecasting, Vehicles, Acoustic noise
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-155069ScopusID: 2-s2.0-84883377594ISBN: 9781627481502OAI: diva2:760963
13th International Congress on Sound and Vibration 2006, ICSV 2006, 2-6 July 2006, Vienna, Austria

QC 20141105

Available from: 2014-11-05 Created: 2014-10-30 Last updated: 2014-11-05Bibliographically approved

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MWL Vibration monitoringMarcus Wallenberg Laboratory MWL
Fluid Mechanics and Acoustics

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